Sofa



FIG. 1 is a right front perspective view of a sofa showing our new design;

FIG. 2 is a left elevational view thereof, the right side elevation being a mirror image;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left rear perspective view thereof;

FIG. 6 is a right front perspective exploded view, shown in the non-reclined position; and,

FIG. 7 is a front elevational view, shown in the non-reclined position thereof.

The elements shown in broken lines illustrate portions of the sofa that form no part of the claimed design. 

CLAIM The ornamental design for a sofa, as shown and described. 